Approximately 40,000 new cases of head and neck cancer are diagnosed annually in the United States (Jemal et al, 2003), and over 30% of these patients are expected to die of their malignancy. Squamous cell carcinoma accounts for more than 90% of head and neck cancer cases. Although metastatic disease at the time of diagnosis is rather uncommon, and despite aggressive use of up-front concurrent radiation and cisplatin-based chemotherapy, approximately 20% of the patients will develop metastases. Patients with recurrent or metastatic squamous cell carcinoma of the head and neck (SCCHN) have a poor prognosis